Volvo Penta Adjusting Screw 860950 | AD31 AD41 TAMD31 TAMD41 KAD42 KAD44 TMD31 TMD41 D3
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Part Number: 860950
Brand: Volvo Penta (OEM Genuine)
Official Part Name: Adjusting Screw
Application: Engine adjustment assembly — confirm specific position by engine model and diagram
Genuine Volvo Penta 860950 is an OEM adjusting screw used across a broad range of Volvo Penta 31-, 41-, 42-, 43-, 44-, and D3-series marine diesel engines. Application references place it across multiple engine families sharing related block and valve-train architecture. Because adjusting screws can appear in more than one assembly position within the same engine, the exact installation point should be confirmed by the applicable Volvo Penta engine parts diagram and serial number before ordering.
Compatible Applications
- Volvo Penta AD31 and AD31 variants
- Volvo Penta AD41 and AD41 variants
- Volvo Penta D3-110 / D3-130 / D3-160 and related D3 variants
- Volvo Penta D41 variants
- Volvo Penta KAD32P
- Volvo Penta KAD42A / KAD42B / KAD42P-A
- Volvo Penta KAMD42A / KAMD42B / KAMD42P-A
- Volvo Penta KAD43P-A / KAD43P-B
- Volvo Penta KAMD43P / KAMD43P-A / KAMD43P-B
- Volvo Penta KAD44P / KAD44P-B / KAD44P-C
- Volvo Penta KAMD44P-A / KAMD44P-B / KAMD44P-C
- Volvo Penta MD31
- Volvo Penta TAMD31A / TAMD31B / TAMD31D and related TAMD31 variants
- Volvo Penta TAMD41A / TAMD41B / TAMD41D and related TAMD41 variants
- Volvo Penta TAMD42A / TAMD42B
- Volvo Penta TMD31A / TMD31B / TMD31D and related TMD31 variants
- Volvo Penta TMD41A / TMD41B / TMD41D and related TMD41 variants
- Confirm exact engine model, serial number, and assembly diagram position before ordering — adjusting screws can appear in more than one location within the same engine family
Engine Family: Volvo Penta 31-, 41-, 42-, 43-, 44-, and D3-series marine diesel
System: Engine adjustment hardware — confirm specific assembly position by diagram
Diagram Position: Verify against the applicable Volvo Penta engine parts diagram for the exact engine model and serial number
Superseded / Alternate Part Numbers
- Current OEM: 860950
- No confirmed Volvo Penta OEM superseding number identified at this time
When to Replace
- Original screw is damaged, bent, corroded, or has stripped threads
- Screw is no longer able to hold correct adjustment in the applicable assembly
- Screw is removed during engine service and is no longer suitable for reuse
- Visible wear or deformation at the contact or locking surfaces
- During engine overhaul or major service when all related hardware is being renewed
Service Interval
Replacement is condition-based. Inspect the screw whenever the relevant assembly is opened for service. An adjusting screw that cannot hold its set position reliably should be replaced before reassembly to avoid repeat service work.
Installation Notes
- Confirm the assembly position and installation procedure against the applicable Volvo Penta service manual and parts diagram for the exact engine model and serial number
- Match the replacement screw exactly by part number — do not substitute by appearance, as thread pitch, length, and tip geometry are specific to the assembly
- Set adjustment to the specification given in the applicable Volvo Penta service manual after installation
- Inspect the locking nut and adjacent hardware while the assembly is open
Technical FAQ
Why does 860950 appear across so many different Volvo Penta engine families?
860950 is used across several Volvo Penta diesel families that share a related engine architecture across the 31-, 41-, and 42-series blocks, as well as selected D3 and KAD applications. A common adjusting screw specification can appear in the same functional position across multiple engine generations built on the same platform.
How do I confirm this is the right adjusting screw for my engine?
Check the engine model and serial number against the Volvo Penta parts diagram for the specific assembly where the screw is used. Because adjusting screws can appear in more than one position within the same engine, diagram confirmation is the only reliable method — ordering by engine family alone is not sufficient.
Can I reuse the original screw?
Only after careful inspection. If the threads, contact tip, or locking surfaces show any wear, corrosion, or deformation, replace the screw. An adjusting screw that cannot hold its position reliably will cause the adjustment to drift and may result in repeat service calls.
Parts Desk Insights
860950 is a part where the most important thing at the counter is confirming which assembly the customer is working on. Adjusting screws appear in several positions across these engine families, and ordering the wrong one — even within the same engine model — is a common mistake. Always ask for the engine serial number and the specific assembly or system being serviced before confirming the order. If the screw is being replaced because the adjustment will not hold, it is also worth asking whether the locking nut and surrounding hardware have been inspected, as a worn locking nut is sometimes the root cause rather than the screw itself.
Related Parts
- Volvo Penta Valve Cover Gasket 859120 — valve cover sealing, commonly serviced alongside valve-train hardware
- Volvo Penta Glow Plug Sealing Ring 859211 | AD31 AD41 TAMD31 TAMD41 TMD31 TMD41
- Volvo Penta Heat Exchanger Sealing Strip 860127 | AD31 AD41 TAMD31 TAMD41 KAD42 KAD44 KAD300
- Volvo Penta Aftercooler Gasket 859196 – AQAD40 / TAMD40
- Volvo Penta Engine Overhaul Gasket Kit 11705955
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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Packaging must be undamaged and suitable for resale
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